I have been successfully casting 45 boolits for a few weeks now and have moved onto 9mm. I slugged my barrel and found that it is .355". I bought the lee 6 cavity 124gr truncated cone mold and a lee 356 sizer kit. I cast some boolits, loaded them up and shot them. The accuracy was fine and they cycled just fine except I got quite a bit of leading. When I got home I measured the diameter of a few of the boolits and found that they were all .354, I checked with 2 different calipers so I know they were right.is it normal for lee sizer dies to under size a boolit? My 45s I cast and size at 452 and they come out as 452.
Is the under sized boolit causing the leading or could it be the load data? I'm casting with 50/50 ww/pure lead and loading with 4.5gr unique @ 1.110 oal.